Optics: measuring and testing – Lens or reflective image former testing – Focal length measuring
Patent
1977-03-28
1979-02-13
Corbin, John K.
Optics: measuring and testing
Lens or reflective image former testing
Focal length measuring
356127, G01B 900
Patent
active
041393058
ABSTRACT:
Apparatus for measuring the refractive properties of a sphero-cylindrical lens system of the type utilizing an incident light beam scanned in at a predetermined radius about the central axis of the lens system to provide a refracted beam. A generally opaque mask having an annular transparent portion is positioned in the path of the refracted beam, to eliminate errors caused by deviations in radial height from the scanning radius of the refracted beam as it exits the lens system due to refraction within the interior of the optical system. A position-sensitive photodetector generates a signal indicative of the instantaneous position in a given plane due to refraction of the portions of the light beam passing through the mask. The photodetector output signal is then processed to provide an indication of the refractive properties. Various embodiments of the mask are also disclosed. Also permutations of the above including pinhole aperture, input light and other detection means is discussed.
REFERENCES:
patent: 3832066 (1974-08-01), Cornsweet
patent: 3880525 (1975-04-01), Johnson
patent: 4007990 (1977-02-01), McDevitt et al.
Acuity Systems, Incorporated
Corbin John K.
Rosenberger R. A.
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